Dell UltraSharp U2422H User Manual page 86

3. Toggle the Joystick to highlight the Diagnostics icon, then press the Joystick,
and a gray screen appears.
4. Carefully inspect the screen for abnormalities.
5. Toggle the Joystick up. The color of the screen changes to red.
6. Inspect the display for any abnormalities.
7. Repeat steps 5 and 6 to inspect the display in green, blue, black, white and
text screens.
The test is complete when the text screen appears. To exit, toggle the Joystick up
again.
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86 Troubleshooting